Retevis RT23 Manual page 18

then PF1 and PF2 are in sub-channel transmit.
6、Menu Mode
Press[ ]key to enter menu mode, total 38 functions. Please refer to shortcut operation.
7、Restart Mode
Press [PTT] key and 1 key and VFO to enter restart mode, initialize all setting under frequency
mode.
Press [PTT] key and 2 key and FULL to enter restart mode, initialize all setting under channel
mode.
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